Jacket TKY node double-side welding method and offshore wind power jacket

Abstract

The invention relates to a jacket TKY node double-side welding method and an offshore wind power jacket, and the method comprises the following steps: S1, determining qualified welding process parameters through a welding process evaluation test, and compiling a welding process procedure; s2, a branch pipe and a main pipe of a TKY node are rolled according to the requirements of a design drawing of the jacket, and saddle-shaped groove cutting is conducted on the branch pipe; s3, preparation before welding is conducted, specifically, groove assembling and preheating before welding are conducted; and S4, double-sided welding is conducted on the TKY joints of the jacket. All-position full-penetration double-sided welding of the TKY joint can be realized by the saddle-shaped groove of the branch pipe for double-sided welding of the TKY joint at different dihedral angles, so that the mechanical property and the physical and chemical test property of a welding joint meet the requirements of DNVGL-OS-C401 standard specifications and project specifications; and the cutting level and the welding quality of the saddle-shaped groove of the TKY joint are improved, and meanwhile the welding efficiency of the TKY joint is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and in particular relates to a double-sided welding method for TKY nodes of a jacket and an offshore wind power jacket. Background technique [0002] In previous offshore engineering platform jacket projects, the TKY joints were single-sided welded, and the TKY joints of the jacket project, the standard name is Tubular joint / Branch connection. When the dihedral angles are different and multi-segment steel pipes are connected and welded to each other, they will appear in T-shaped, Y-shaped or K-shaped shapes, so they are commonly called TKY joints. For the TKY joints of the jacket involved, the bevel form is cut into a saddle-shaped bevel by a special beveling machine; the saddle-shaped bevel at the 12 o'clock-3 o'clock-6 o'clock-9 o'clock position of the branch pipe is all single-sided Groove, the angle is constantly changing, local positions such as 12 o'clock and 6 o'clock, the dihe...

AI Technical Summary

Problems solved by technology

Single-sided welding requires SMAW single-sided welding and double-sided molding, which is difficult to operate, low in efficiency, difficult to penetrate the root weld, and difficult to guarantee quality; the root area is prone to many welding defects, including NDT (non-destructive testing) is also difficult to detect defects; according to the AWS D1.1 standard and related design requirements, the low-temperature impact requirements of previous offshore jacket projects were lower than 0°C or -20°C; the penetration requirements and NDT inspection requirements acceptance criteria for single-sided welding of TKY nodes, etc. less demanding

[0003] The Seagreen offshore wind power jacket project is located in the Nordic waters; the British Seagreen offshore wind power jacket project is developed by the British government, Seagreen is the major owner, and Subsea7 is the first offshore wind power jacket project built in China by the general contractor. From the material There are great challenges and difficulties in model selection, structural design, welding design, welding implementation of DNVGL-OS-C401 standard, welding process development, on-site construction, quality control, and precision dimension control; Unable to meet Seagreen offshore wind jacket requirements

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